pseudonom-

The Dapper paper mentions "An engineer working on long tail latency debugging built a small library which infers hierarchical critical paths from DAPI Trace objects. These critical path structures were then used to diagnose problems and prioritize prospective performance improvements for universal search."

Do any of the distributed tracing services (e.g. Datadog APM, AWS X-Ray) offer this? I don't see any services which tout this functionality.